The Cumberland Motor Club autocross program follows the SCCA Solo rulebook for car classification. You will need to determine what class your car will be running in before you register for an event. Classes are based on what car you are driving, and what modifications you have made to it. This means that a stock Civic will not compete directly against a highly modified turbo Civic, or a Corvette of any kind. Click here to view the full SCCA Solo rulebook.
Click here for a handy classing tool to help you get started.
CMC has relaxed SCCA classing guidelines for some specific categories. The full list of those changes can be viewed here.